I usually try not to write poor reviews unless it's really warranty but I wanted to mention for those who are booking the Koloa Zipline. We just got our tour cancelled due to shortage of guides. Although not ideal, things like this happen. The unfortunate part is that is was cancelled a week before the tour. I called to inquire about potentially rebooking and they asked how long we would be on the island but nope, there was nothing they could do.
So a combination of lack of empathy or even any sort of apology leads me to write this review. In addition, pretty much everything else we potentially wanted to do is booked so that kind of sucks.
Again, stuff like this happens but make sure to have some back up plans in place - we'll likely just do more beach or pool time - not the worst, but we would have loved to experience these zip lines.